/Engine/Source/Editor/AIGraph/Public/SGraphNodeAI.h
Gets decorator or service node if one is found under mouse cursor
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SGraphNode](API\Editor\GraphEditor\SGraphNode) > GetSubNodeUnderCursor ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & WidgetGeometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent )